Chemistry Reference
In-Depth Information
Reactions in the presence of alcohols take a somewhat different path [
142
,
143
]:
R
3
N
+
R
3
N
R'OH
HOR'
R
3
N
H
OR'
O
R
3
N
+
HOR'
O
O
O
O
O
R
3
N
HO
O
O
O
O
R
3
N
HO
OR'
O
OR'
O
where, R
0
OH represents both epoxidemolecules with hydroxyl function and other alcohols in the system.
Another similar group of epoxy resins, called
, forms fromreactions of epichlorohydrin
with lowmolecular weight phenolic novolacs (phenolic novolac resins are discussed in the next section):
epoxy novolacs
O
OH
O
O
+
Cl
n
n
O
+
also
Cl
n
n
O
OH
O
where,
is typically 2.2-3.8 for liquid epoxy novolacs and 3-7 for solid resins. Epoxy resins are also
prepared commercially from Bisphenol F that is a blend of
ortho
and
para
diphenol methanes:
n
O
O
O
O
